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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Provision for credit losses | $ (11,212) | $ (2,708) | $ (49,038) | $ (9,638) |  |  |
Ending Balance |  |  |  |  | $ 88,307 |  | $ 50,035
Ending balance: individually evaluated for impaired |  |  |  |  | 7,418 |  | 1,546
Ending balance: collectively evaluated for impaired |  |  |  |  | 80,889 |  | 48,489
Total |  |  |  |  | 6,949,716 | $ 6,189,148 | 6,099,561
Ending balance: individually evaluated for impaired |  |  |  |  | 36,969 |  | 25,344
Ending balance: collectively evaluated for impaired |  |  |  |  | 6,912,747 |  | 6,074,217
Residential real estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 8,252 |  | 3,917
Ending balance: individually evaluated for impaired |  |  |  |  |  |  | 4
Ending balance: collectively evaluated for impaired |  |  |  |  |  |  | 3,913
Total |  |  |  |  | 1,744,020 |  | 1,666,220
Ending balance: individually evaluated for impaired |  |  |  |  |  |  | 4,102
Ending balance: collectively evaluated for impaired |  |  |  |  |  |  | 1,662,118
Commercial Real Estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 42,244 |  | 19,048
Ending balance: individually evaluated for impaired |  |  |  |  | 5,921 |  | 488
Ending balance: collectively evaluated for impaired |  |  |  |  | 36,323 |  | 18,560
Total |  |  |  |  | 2,215,311 |  | 2,124,240
Ending balance: individually evaluated for impaired |  |  |  |  | 30,387 |  | 10,825
Ending balance: collectively evaluated for impaired |  |  |  |  | 2,184,924 |  | 2,113,415
Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 25,488 |  | 19,947
Ending balance: individually evaluated for impaired |  |  |  |  | 1,497 |  | 1,054
Ending balance: collectively evaluated for impaired |  |  |  |  | 23,991 |  | 18,893
Total |  |  |  |  | 1,736,736 |  | 1,210,936
Ending balance: individually evaluated for impaired |  |  |  |  | 5,048 |  | 10,417
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,731,688 |  | 1,200,519
Real estate construction [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 3,508 |  | 2,410
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 3,508 |  | 2,410
Total |  |  |  |  | 452,989 |  | 420,281
Ending balance: individually evaluated for impaired |  |  |  |  | 308 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 452,681 |  | 420,281
Residential real estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  |
Ending balance: collectively evaluated for impaired |  |  |  |  | 8,252 |  |
Ending balance: individually evaluated for impaired |  |  |  |  | 1,226 |  |
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,742,794 |  |
Loans to individuals [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 8,815 |  | 4,713
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 8,815 |  | 4,713
Total |  |  |  |  | 800,660 |  | 677,884
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 800,660 |  | 677,884
Acquired Loans [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 1,859 | 65 | 52 | 178 |  |  |
Charge-offs | (202) | (1,428) | (502) | (2,032) |  |  |
Recoveries | 28 | 32 | 76 | 113 |  |  |
Provision for credit losses | (293) | (1,360) | (2,352) | (1,770) |  |  |
Ending Balance | 1,859 | 65 | 52 | 178 | 1,978 | 52 | 29
Total |  |  |  |  | 373,876 | 474,775 |
Acquired Loans [Member] | Residential real estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 0 | 25 | 2 | 35 |  |  |
Charge-offs | (122) | 0 | (213) | (46) |  |  |
Recoveries | 13 | 11 | 38 | 46 |  |  |
Provision for credit losses | (109) | 35 | (173) | 34 |  |  |
Ending Balance | 0 | 25 | 2 | 35 | 0 | 2 | 1
Total |  |  |  |  | 209,071 | 265,554 |
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 1,356 | 25 | 37 | 4 |  |  |
Charge-offs | 0 | (1,376) | (2) | (1,376) |  |  |
Recoveries | 0 | 0 | 0 | 0 |  |  |
Provision for credit losses | (286) | (1,372) | (1,607) | (1,393) |  |  |
Ending Balance | 1,356 | 25 | 37 | 4 | 1,642 | 37 | 21
Total |  |  |  |  | 127,094 | 159,173 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 332 | 15 | 13 | 139 |  |  |
Charge-offs | 0 | (49) | 0 | (601) |  |  |
Recoveries | 13 | 21 | 28 | 53 |  |  |
Provision for credit losses | 9 | (20) | (295) | (416) |  |  |
Ending Balance | 332 | 15 | 13 | 139 | 336 | 13 | 7
Total |  |  |  |  | 25,122 | 29,827 |
Acquired Loans [Member] | Real estate construction [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 171 | 0 | 0 | 0 |  |  |
Charge-offs | 0 | 0 | 0 | 0 |  |  |
Recoveries | 0 | 0 | 0 | 0 |  |  |
Provision for credit losses | 171 | 0 | 0 | 0 |  |  |
Ending Balance | 171 | 0 | 0 | 0 | 0 | 0 | 0
Total |  |  |  |  | 2,400 | 6,262 |
Acquired Loans [Member] | Loans to individuals [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 0 | 0 | 0 | 0 |  |  |
Charge-offs | (80) | (3) | (287) | (9) |  |  |
Recoveries | 2 | 0 | 10 | 14 |  |  |
Provision for credit losses | (78) | (3) | (277) | 5 |  |  |
Ending Balance | 0 | 0 | 0 | 0 | 0 | 0 | 0
Total |  |  |  |  | 10,189 | 13,959 |
Originated Loans [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 79,582 | 50,996 | 51,585 | 47,586 |  |  |
Charge-offs | (4,705) | (2,702) | (13,259) | (6,555) |  |  |
Recoveries | 533 | 364 | 1,317 | 1,107 |  |  |
Provision for credit losses | (10,919) | (1,348) | (46,686) | (7,868) |  |  |
Ending Balance | 79,582 | 50,996 | 51,585 | 47,586 | 86,329 | 51,585 | 50,006
Total |  |  |  |  | 6,575,840 | 5,714,373 |
Originated Loans [Member] | Residential real estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 9,239 | 4,133 | 4,091 | 3,934 |  |  |
Charge-offs | (161) | (383) | (720) | (617) |  |  |
Recoveries | 153 | 6 | 274 | 190 |  |  |
Provision for credit losses | 979 | (160) | (4,607) | (409) |  |  |
Ending Balance | 9,239 | 4,133 | 4,091 | 3,934 | 8,252 | 4,091 | 3,916
Total |  |  |  |  | 1,534,949 | 1,415,808 |
Originated Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 33,130 | 19,287 | 19,731 | 18,382 |  |  |
Charge-offs | 0 | (6) | (2,415) | (305) |  |  |
Recoveries | 110 | 81 | 154 | 160 |  |  |
Provision for credit losses | (7,362) | 335 | (23,132) | (790) |  |  |
Ending Balance | 33,130 | 19,287 | 19,731 | 18,382 | 40,602 | 19,731 | 19,027
Total |  |  |  |  | 2,088,217 | 1,958,346 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 24,812 | 20,678 | 20,221 | 19,235 |  |  |
Charge-offs | (3,395) | (742) | (5,166) | (1,584) |  |  |
Recoveries | 44 | 41 | 161 | 180 |  |  |
Provision for credit losses | (3,691) | 37 | (9,936) | (2,109) |  |  |
Ending Balance | 24,812 | 20,678 | 20,221 | 19,235 | 25,152 | 20,221 | 19,940
Total |  |  |  |  | 1,711,614 | 1,212,026 |
Originated Loans [Member] | Real estate construction [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 3,067 | 2,491 | 2,558 | 2,002 |  |  |
Charge-offs | 0 | 0 | 0 | 0 |  |  |
Recoveries | 0 | 74 | 26 | 158 |  |  |
Provision for credit losses | (441) | 155 | (924) | (250) |  |  |
Ending Balance | 3,067 | 2,491 | 2,558 | 2,002 | 3,508 | 2,558 | 2,410
Total |  |  |  |  | 450,589 | 442,777 |
Originated Loans [Member] | Loans to individuals [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 9,334 | 4,407 | 4,984 | 4,033 |  |  |
Charge-offs | (1,149) | (1,571) | (4,958) | (4,049) |  |  |
Recoveries | 226 | 162 | 702 | 419 |  |  |
Provision for credit losses | (404) | (1,715) | (8,087) | (4,310) |  |  |
Ending Balance | $ 9,334 | $ 4,407 | $ 4,984 | $ 4,033 | 8,815 | 4,984 | $ 4,713
Total |  |  |  |  | $ 790,471 | $ 685,416 |

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